Calculate the formula mass of sodium carbonate.

1.   ?    51.0
2.   ?    60.0
3.   ?    66.99
4.   ?    82.99
5.   ?    105.99

Which statement is not correct regarding a mole?

1.   ?    A mole of ¹²C atoms contains 6.02x10²³ atoms.
2.   ?    A mole of O₂ gas contains the same number of molecules as a mole of H₂ gas.
3.   ?    Exactly 12g of carbon-12 is one mole of carbon-12.
4.   ?    A mole of O₂ gas has the same mass as a mole of N₂ gas.
5.   ?    The mass of one ¹²C atom is 12.0/6.02x10²³g.

How many Cl^- ions are present in 50.0g of FeCl₃?

1.   ?    1.41
2.   ?    1.85x10²³
3.   ?    5.57x10²³
4.   ?    3.01x10²⁵
5.   ?    150

Calculate the average mass, in grams, of an O₂ molecule.

1.   ?    32.0
2.   ?    2.00
3.   ?    2.66x10^-23
4.   ?    1.88x10^-22
5.   ?    5.32x10^-23

Calculate the number of molecules in 2.86g of CO₂.

1.   ?    6.48x10¹⁵
2.   ?    1.30x10²²
3.   ?    3.91x10²²
4.   ?    1.17x10²³
5.   ?    9.26x10²⁴

Calculate the number of atoms in 48.0g of glucose, C₆H₁₂O₆.

1.   ?    2.26x10²²
2.   ?    1.60x10²³
3.   ?    3.85x10²⁴
4.   ?    1.64x10¹⁶
5.   ?    9.24x10²⁵

What mass, in grams, of phosphorus is present in 95.2g of ammonium phosphate ((NH₄)₃PO₄)?

1.   ?    95.2
2.   ?    19.8
3.   ?    149
4.   ?    24.4
5.   ?    More information is needed to answer this question.

A 0.250g sample of a compound containing only carbon and hydrogen whose molecular weight is about 32u is burned in oxygen to yield 0.784g CO₂ and 0.642g H₂O. What is the molecular formula?

1.   ?    CH₄
2.   ?    C₂H₄
3.   ?    C₃H₈
4.   ?    C₂H₈
5.   ?    C₅H₆

What is the mass percentage of oxygen in acetic acid, CH₃CO₂H?

1.   ?    26.64%
2.   ?    46.71%
3.   ?    53.29%
4.   ?    73.36%

What is the name of (NH₄)₂Cr₂O₇?

1.   ?    ammonium dichromium heptaoxide
2.   ?    dichromate diammine
3.   ?    diammonia dichromate
4.   ?    ammonium dichromate

What is the formula for calcium fluoride?

1.   ?    CaF
2.   ?    CaF₂
3.   ?    Ca₂F
4.   ?    Ca₂F₃

What is the formula for plumbic sulfate?

1.   ?    PbS
2.   ?    Pb(SO₃)₂
3.   ?    PbSO₄
4.   ?    Pb(SO₄)₂

A 2.000g sample of CoCl₂*xH₂O is dried in an oven. When the anhydrous salt is removed from the oven, its mass is 1.565g. What is the value of x?

1.   ?    1
2.   ?    2
3.   ?    3
4.   ?    4
5.   ?    6

In which ionic compound, NaBr or KBr, is the force of attraction between anions and cations stronger?

1.   ?    NaBr
2.   ?    KBr

An ionic compound has the formula MBr₄. The mass of 0.2353mol of the compound is 103.14g. What is the identity of the metal?

1.   ?    Pb
2.   ?    Ti
3.   ?    Sn
4.   ?    Hg
5.   ?    Ba